<template>
  <div class>
    <!-- 面包屑 -->
    <breadcrumb>
      <span slot="main">商品管理</span>
      <span slot="main_a">分类参数</span>
    </breadcrumb>
    <!-- 卡片 -->
    <el-card class="box-card">
      <!-- 警告区 -->
      <el-alert title="注意：只允许为第三季分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>
      <!-- 选中商品分类区 -->
      <el-row>
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入tag标签 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加tag按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="delParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
          >添加属性</el-button>
          <!-- 静态属性面板表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入tag标签 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加tag按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="delParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数输入框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑修改参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数输入框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态参数数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  // 计算属性中定义一个函数来控制button按钮的禁用和使用
  computed: {
    // 如果按钮需要被禁用， 则返回true ，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 商品分类列表
    async getCateList() {
      let res = await this.$axios.get('categories')
      // console.log(res)
      if (res.data.meta.status !== 200) {
        return this.$message.error('获取失败！')
      }
      // this.$message.success('获取成功！')
      this.catelist = res.data.data
      // console.log(this.catelist)
    },
    // 级联选择的确定
    handleChange() {
      this.getParamsData()
    },
    // tab 页签点击事件处理函数
    handleTabClick() {
      // console.log(this.activeName)
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData() {
      // console.log(this.selectedCateKeys)
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的id和当前所处的面板，获取对应的参数
      let res = await this.$axios.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })

      if (res.data.meta.status !== 200) {
        return this.$message.error('获取参数失败！')
      }
      // console.log(res.data.data)
      // 获取值后进行循环，显示展开行数据
      res.data.data.forEach(item => {
        // 判断分割后的获取的值是否为有值存在
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 添加布尔值，控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      // console.log(res.data.data)

      // this.$message.success('获取成功！')
      if (this.activeName === 'many') {
        this.manyTableData = res.data.data
      } else {
        this.onlyTableData = res.data.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        let res = await this.$axios.post(
          `categories/${this.cateId}/attributes`,
          {
            // 自定义数据取值 和 activeName向指定的选中name取值
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        // console.log(res.data.data)
        if (res.data.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
        // this.catelist = res.data.data
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog(attr_id) {
      // console.log(attr_id)
      // 查询当前参数的信息
      let res = await this.$axios.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      )
      console.log(res)
      if (res.data.meta.status !== 200) {
        return this.$message.error('获取参数失败！')
      }
      // console.log(res.data.data)
      // this.$message.success('获取成功！')
      // 给对话框取反
      this.editForm = res.data.data
      this.editDialogVisible = true
    },
    // 监听对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 修改属性操作
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        let res = await this.$axios.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        // console.log(res)
        if (res.data.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        // console.log(res.data.data)
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 删除属性操作
    async delParams(id) {
      let confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 用户取消删除
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }

      // 删除
      let res = await this.$axios.delete(
        `categories/${this.cateId}/attributes/${id}`
      )
      // console.log(res)
      if (res.data.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.getParamsData()
      // this.editDialogVisible = false
    },
    // 展示行文本框失去焦点与enter键都会触发
    handleInputConfirm(row) {
      // console.log(123)
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return 者证明输入了内容需要后续的处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求 ，保存这次操作
      this.saveAttrVals(row)
    },
    // 点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick 方法作用 当页面上的数据重新被渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将对attr_vals 的操作，保存到数据库
    async saveAttrVals(row) {
      // 需要发起接口请求经数据保存到数据库中
      let res = await this.$axios.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.data.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    },
    // 删除对应的参数和选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>

<style scoped lang='less'>
.el-col {
  font-family: '楷体';
  font-size: 16px;
  font-weight: bold;
  margin-top: 15px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
